forked from OSchip/llvm-project
254 lines
8.6 KiB
C++
254 lines
8.6 KiB
C++
//===- GenerateCode.cpp - Functions for generating executable files ------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file contains functions for generating executable files once linking
|
|
// has finished. This includes generating a shell script to run the JIT or
|
|
// a native executable derived from the bytecode.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "gccld.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/PassManager.h"
|
|
#include "llvm/Analysis/LoadValueNumbering.h"
|
|
#include "llvm/Analysis/Verifier.h"
|
|
#include "llvm/Bytecode/WriteBytecodePass.h"
|
|
#include "llvm/Target/TargetData.h"
|
|
#include "llvm/Transforms/IPO.h"
|
|
#include "llvm/Transforms/Scalar.h"
|
|
#include "llvm/Transforms/Utils/Linker.h"
|
|
#include "Support/SystemUtils.h"
|
|
#include "Support/CommandLine.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
cl::opt<bool>
|
|
DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
|
|
|
|
cl::opt<bool>
|
|
Verify("verify", cl::desc("Verify intermediate results of all passes"));
|
|
|
|
cl::opt<bool>
|
|
DisableOptimizations("disable-opt",
|
|
cl::desc("Do not run any optimization passes"));
|
|
}
|
|
|
|
namespace llvm {
|
|
|
|
static inline void addPass(PassManager &PM, Pass *P) {
|
|
// Add the pass to the pass manager...
|
|
PM.add(P);
|
|
|
|
// If we are verifying all of the intermediate steps, add the verifier...
|
|
if (Verify) PM.add(createVerifierPass());
|
|
}
|
|
|
|
/// GenerateBytecode - generates a bytecode file from the specified module.
|
|
///
|
|
/// Inputs:
|
|
/// M - The module for which bytecode should be generated.
|
|
/// Strip - Flags whether symbols should be stripped from the output.
|
|
/// Internalize - Flags whether all symbols should be marked internal.
|
|
/// Out - Pointer to file stream to which to write the output.
|
|
///
|
|
/// Outputs:
|
|
/// None.
|
|
///
|
|
/// Returns non-zero value on error.
|
|
///
|
|
int
|
|
GenerateBytecode (Module *M, bool Strip, bool Internalize, std::ostream *Out) {
|
|
// In addition to just linking the input from GCC, we also want to spiff it up
|
|
// a little bit. Do this now.
|
|
PassManager Passes;
|
|
|
|
if (Verify) Passes.add(createVerifierPass());
|
|
|
|
// Add an appropriate TargetData instance for this module...
|
|
addPass(Passes, new TargetData("gccld", M));
|
|
|
|
// Often if the programmer does not specify proper prototypes for the
|
|
// functions they are calling, they end up calling a vararg version of the
|
|
// function that does not get a body filled in (the real function has typed
|
|
// arguments). This pass merges the two functions.
|
|
addPass(Passes, createFunctionResolvingPass());
|
|
|
|
if (!DisableOptimizations) {
|
|
// Linking modules together can lead to duplicated global constants, only
|
|
// keep one copy of each constant...
|
|
addPass(Passes, createConstantMergePass());
|
|
|
|
// If the -s command line option was specified, strip the symbols out of the
|
|
// resulting program to make it smaller. -s is a GCC option that we are
|
|
// supporting.
|
|
if (Strip)
|
|
addPass(Passes, createSymbolStrippingPass());
|
|
|
|
if (Internalize) {
|
|
// Now that composite has been compiled, scan through the module, looking
|
|
// for a main function. If main is defined, mark all other functions
|
|
// internal.
|
|
addPass(Passes, createInternalizePass());
|
|
}
|
|
|
|
// Propagate constants at call sites into the functions they call.
|
|
addPass(Passes, createIPConstantPropagationPass());
|
|
|
|
// Remove unused arguments from functions...
|
|
addPass(Passes, createDeadArgEliminationPass());
|
|
|
|
if (!DisableInline)
|
|
addPass(Passes, createFunctionInliningPass()); // Inline small functions
|
|
|
|
// Run a few AA driven optimizations here and now, to cleanup the code.
|
|
// Eventually we should put an IP AA in place here.
|
|
|
|
addPass(Passes, createLICMPass()); // Hoist loop invariants
|
|
addPass(Passes, createLoadValueNumberingPass()); // GVN for load instrs
|
|
addPass(Passes, createGCSEPass()); // Remove common subexprs
|
|
|
|
// The FuncResolve pass may leave cruft around if functions were prototyped
|
|
// differently than they were defined. Remove this cruft.
|
|
addPass(Passes, createInstructionCombiningPass());
|
|
|
|
// Delete basic blocks, which optimization passes may have killed...
|
|
addPass(Passes, createCFGSimplificationPass());
|
|
|
|
// Now that we have optimized the program, discard unreachable functions...
|
|
addPass(Passes, createGlobalDCEPass());
|
|
}
|
|
|
|
// Make sure everything is still good.
|
|
Passes.add(createVerifierPass());
|
|
|
|
// Add the pass that writes bytecode to the output file...
|
|
addPass(Passes, new WriteBytecodePass(Out));
|
|
|
|
// Run our queue of passes all at once now, efficiently.
|
|
Passes.run(*M);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/// GenerateAssembly - generates a native assembly language source file from the
|
|
/// specified bytecode file.
|
|
///
|
|
/// Inputs:
|
|
/// InputFilename - The name of the output bytecode file.
|
|
/// OutputFilename - The name of the file to generate.
|
|
/// llc - The pathname to use for LLC.
|
|
/// envp - The environment to use when running LLC.
|
|
///
|
|
/// Outputs:
|
|
/// None.
|
|
///
|
|
/// Return non-zero value on error.
|
|
///
|
|
int
|
|
GenerateAssembly(const std::string &OutputFilename,
|
|
const std::string &InputFilename,
|
|
const std::string &llc,
|
|
char ** const envp)
|
|
{
|
|
// Run LLC to convert the bytecode file into assembly code.
|
|
const char *cmd[8];
|
|
|
|
cmd[0] = llc.c_str();
|
|
cmd[1] = "-f";
|
|
cmd[2] = "-o";
|
|
cmd[3] = OutputFilename.c_str();
|
|
cmd[4] = InputFilename.c_str();
|
|
cmd[5] = NULL;
|
|
|
|
return ExecWait(cmd, envp);
|
|
}
|
|
|
|
/// GenerateNative - generates a native assembly language source file from the
|
|
/// specified assembly source file.
|
|
///
|
|
/// Inputs:
|
|
/// InputFilename - The name of the output bytecode file.
|
|
/// OutputFilename - The name of the file to generate.
|
|
/// Libraries - The list of libraries with which to link.
|
|
/// LibPaths - The list of directories in which to find libraries.
|
|
/// gcc - The pathname to use for GGC.
|
|
/// envp - A copy of the process's current environment.
|
|
///
|
|
/// Outputs:
|
|
/// None.
|
|
///
|
|
/// Returns non-zero value on error.
|
|
///
|
|
int
|
|
GenerateNative(const std::string &OutputFilename,
|
|
const std::string &InputFilename,
|
|
const std::vector<std::string> &Libraries,
|
|
const std::vector<std::string> &LibPaths,
|
|
const std::string &gcc,
|
|
char ** const envp) {
|
|
// Remove these environment variables from the environment of the
|
|
// programs that we will execute. It appears that GCC sets these
|
|
// environment variables so that the programs it uses can configure
|
|
// themselves identically.
|
|
//
|
|
// However, when we invoke GCC below, we want it to use its normal
|
|
// configuration. Hence, we must sanitize its environment.
|
|
char ** clean_env = CopyEnv(envp);
|
|
if (clean_env == NULL)
|
|
return 1;
|
|
RemoveEnv("LIBRARY_PATH", clean_env);
|
|
RemoveEnv("COLLECT_GCC_OPTIONS", clean_env);
|
|
RemoveEnv("GCC_EXEC_PREFIX", clean_env);
|
|
RemoveEnv("COMPILER_PATH", clean_env);
|
|
RemoveEnv("COLLECT_GCC", clean_env);
|
|
|
|
std::vector<const char *> cmd;
|
|
|
|
// Run GCC to assemble and link the program into native code.
|
|
//
|
|
// Note:
|
|
// We can't just assemble and link the file with the system assembler
|
|
// and linker because we don't know where to put the _start symbol.
|
|
// GCC mysteriously knows how to do it.
|
|
cmd.push_back(gcc.c_str());
|
|
cmd.push_back("-o");
|
|
cmd.push_back(OutputFilename.c_str());
|
|
cmd.push_back(InputFilename.c_str());
|
|
|
|
// Adding the library paths creates a problem for native generation. If we
|
|
// include the search paths from llvmgcc, then we'll be telling normal gcc
|
|
// to look inside of llvmgcc's library directories for libraries. This is
|
|
// bad because those libraries hold only bytecode files (not native object
|
|
// files). In the end, we attempt to link the bytecode libgcc into a native
|
|
// program.
|
|
#if 0
|
|
// Add in the library path options.
|
|
for (unsigned index=0; index < LibPaths.size(); index++) {
|
|
cmd.push_back("-L");
|
|
cmd.push_back(LibPaths[index].c_str());
|
|
}
|
|
#endif
|
|
|
|
// Add in the libraries to link.
|
|
std::vector<std::string> Libs(Libraries);
|
|
for (unsigned index = 0; index < Libs.size(); index++) {
|
|
if (Libs[index] != "crtend") {
|
|
Libs[index] = "-l" + Libs[index];
|
|
cmd.push_back(Libs[index].c_str());
|
|
}
|
|
}
|
|
cmd.push_back(NULL);
|
|
|
|
// Run the compiler to assembly and link together the program.
|
|
return ExecWait(&(cmd[0]), clean_env);
|
|
}
|
|
|
|
} // End llvm namespace
|